Keithley 7012-S, Instruction Manual, Page: 65 / 93

Service Information
5-3
CAUTION
After making solder connections to a
connector, remove solder
ß ux as ex-
plained in paragraph 5.2. Failure to
clean the solder connections could
result in degraded performance pre-
venting the card from passing veri
Þ -
cation tests.
Before pre-wiring any connectors plugs, study the fol-
lowing test procedures to fully understand the connec-
tion requirements.
5.3.4 Channel resistance tests
Referring to Figure 5-1, perform the following steps to
verify that each contact of every relay is closing prop-
erly and that the resistance is within speci
Þ cation.
Figure 5-1
Path resistance testing
1
2
3
4
1 3 4 5 6 7 8 9
10
2
Model 7012
Model 196
H
L
H
L
H
L
H
L
Jumpers
Ohms Sense HI
Ohms HI
Ohms LO
Ohms
Sense LO
(Measure 4-Wire Ohms)
Note : Set up shown is configured
to test the high (H) terminal
of row 1 through crosspoints
1!1 through 1!12.
Rows
Columns
5.3.3 Matrix card connections
The following information summarizes methods that
can be used to connect test instrumentation to the two
connector cards. Detailed connection information is
provided in Section 3.
Model 7012-S

Instrumentation can simply be hard-
wired directly to the screw terminals of the connector
card. Jumper wires should be kept as short as possible.
Model 7012-C

One method to make instrument con-
nections to the matrix card is by hard-wiring a 96-pin
female DIN connector and then mating it to the con-
nector on the Model 7012-C. Row and column shorting
connections can also be done at the connector. The con-
nector in the Model 7011-KIT-R connection kit (see Ta-
ble 3-1) can be used for this purpose. Pin identi
Þ cation
for the multi-pin connector for the matrix card is pro-
vided by Figure 3-5.
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